================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:182 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:239 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:256 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:774 [inline] BUG: KASAN: slab-use-after-free in sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 Write of size 4 at addr ffff8880223f6080 by task kworker/1:12/25298 CPU: 1 PID: 25298 Comm: kworker/1:12 Not tainted 6.8.0-rc6-syzkaller-01889-g4b2765ae410a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:182 [inline] __refcount_inc include/linux/refcount.h:239 [inline] refcount_inc include/linux/refcount.h:256 [inline] sock_hold include/net/sock.h:774 [inline] sco_sock_timeout+0x67/0x240 net/bluetooth/sco.c:88 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 25343: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x22e/0x490 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2079 sk_alloc+0x38/0x370 net/core/sock.c:2132 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:526 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x48f/0x920 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x14f/0x3c0 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1718 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 25342: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 sk_prot_free net/core/sock.c:2115 [inline] __sk_destruct+0x476/0x5f0 net/core/sock.c:2207 sco_sock_release+0x25d/0x320 net/bluetooth/sco.c:1256 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x429/0x8a0 fs/file_table.c:376 __do_sys_close fs/open.c:1554 [inline] __se_sys_close fs/open.c:1539 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1539 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff8880223f6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff8880223f6000, ffff8880223f6800) The buggy address belongs to the physical page: page:ffffea000088fc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880223f7000 pfn:0x223f0 head:ffffea000088fc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c42000 0000000000000000 dead000000000001 raw: ffff8880223f7000 0000000000080007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5151, tgid 5151 (kworker/1:4), ts 166158129914, free_ts 166141767784 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x2d1/0x4e0 mm/slub.c:4001 kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:600 __alloc_skb+0x1b1/0x420 net/core/skbuff.c:669 alloc_skb include/linux/skbuff.h:1301 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6507 sock_alloc_send_pskb+0x919/0xa60 net/core/sock.c:2794 sock_alloc_send_skb include/net/sock.h:1870 [inline] mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 add_grhead net/ipv6/mcast.c:1849 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987 mld_send_cr net/ipv6/mcast.c:2113 [inline] mld_ifc_work+0x68e/0xd90 net/ipv6/mcast.c:2650 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 page last free pid 5179 tgid 5179 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17b/0x250 mm/slub.c:2997 __slab_free+0x302/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 mt_alloc_one lib/maple_tree.c:162 [inline] mas_alloc_nodes+0x26c/0x840 lib/maple_tree.c:1242 mas_node_count_gfp lib/maple_tree.c:1322 [inline] mas_preallocate+0xfca/0x1730 lib/maple_tree.c:5508 vma_iter_prealloc mm/internal.h:1147 [inline] vma_expand+0x65f/0xae0 mm/mmap.c:658 mmap_region+0xb3c/0x1fa0 mm/mmap.c:2792 do_mmap+0x7ae/0xe60 mm/mmap.c:1379 vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556 ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425 Memory state around the buggy address: ffff8880223f5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880223f6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880223f6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880223f6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880223f6180: fb fb fb 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